Mortar for stamp-mills.



No. 822,914- PATENTBD JUNE 12, 1906 M. P. BOSS. MORTAR FOB. STAMP MILLS. IIIIIIIIIIIIIIIIIIIIIIII 05 UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

l'atented June 12, 1906.

Application filed June 5, 1905. Serial No. 263,842.

J0 Ml who/rt Lt may concern:

Be it known that I, MARTIN P. Boss, a citizen of the United States, residing in the city and county of San Francisco, State of Cali fornia, have invented certain new and useful Improvements in Mortars for Stamp-Mills, of which the following is a specification.

My invention relates to the class of stampmill mortars.

In order to reduce the vibration of the stamp-stem, so that the factor of stem breakage maybe practically eliminated,it has been my practice to provide a comparatively low guide, to shorten the stem by making the stamp-head long, and to place a housing around the stamp-head itself instead of around the stem, which latter was formerly the universal practice. This housing around the stamp-head is relatively long and serves the important function of preventing splashing from the mortar. It is in connection with this antisplashing-housing that my present invention lies.

The objects of my invention are to secure facility and accuracy in fitting the housing to the mortar and to obtain increased efliciency in the operation of the housing.

To this end my invention consists in the novel construction, arrangement, and combinations of parts, which I shall hereinafter fully describe by reference to the accompanying drawings, in which Figure 1 is a top plan view of the mortar. Fig. 2 is a vertical section of the same. Fig. 3 is a perspective view of one-half of the housing.

Aindicates the'mortar-body,provided with the usual feed-opening a, the usual screendischarge a, and the stamp-dies a In the top of the mortar-body is formed an extended continuous opening a the side walls of which are inclined and converge downwardly to form seats to receive the antisplashing-housing.

B represents the housing. It is constructed in separate similar halves. As shown in Fig. 3, the housing-half comprises a series of semicylinders b and a continuous base bcommon to all the semicylinders, the outer surface I) of said base being flat and inclined downwardly to correspond to the incline of the side walls of the top opening a of the mortar-body. The semicylinders are in their best form divided into two portions, the lower portion having a diameter or width greater than the upper portion, so that a horizontal shoulder or ledge is formed within the semicylinders. In practice the lower portion is best made rectangular in order to conform to the flat-faced base I). The inner face of each semicylinder is formed with in wardly-projecting narrow ribs b at three elevationsto wit, one at the bottom, one at the top, and one intervening, as shown in Fig. 2. These ribs have the same diameter and represent the closest approach of the housing to the stamp-head. Being narrow they can be easily chipped away to the eX- tent necessary to correct an imperfect fit to the stamp-head.

The halves of the housing are separately dropped into the opening in the top of the mortar-body, as is shown in Fig. 2, thereby forming complete sleeves around the stampheads. They are supported in place by the flat inclined outer faces of their bases b finding seats in the beveled side walls of the said top opening. Suitable packing is best placed in this seat. In practice small grooves are cut in the faces of the side walls of the top opening a in which is placed the packing b such, for example, as rope and then the parts of the housing are dropped into place. The housing by thus fitting in the inclined seats is self-tightening, one-half wedging against the other and both by their own weight wedging in the inclined seats.

Crepresents the stamp-head, cits stem, and D indicates the lower guide for the stem. The stamp-head, as will be seen, is relatively long, so that it plays up and down within the housing B, the fit between the two being a comparatively loose one, as there is no need for contact, the length of the housing rendering it unlikely that any splash can pass between it and the stamp-head, for to do so it would have to pass vertically through quite a long distance. The particular construction of the interior of the housing in having the lower wider or larger portion bounded above by the shoulder or ledge b further conduces to this end by practically forming traps which prevent the passage of the splashed material.

Having thusdescribed my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a stamp-mill mortar, a mortar-body having an opening in its top provided with an inwardly-inclined wall, in combination with a housing composed of separate similar halves, each half comprising a semicylinder to receive the stamp-head and a base with a fiat inclined outer face to fit the inclined side wall of the top opening of the mortar-body, whereby the two halves are wedged together in seating.

2. In a stamp-mill mortar, a mortar-body having an opening in its top provided with an inwardly-inclined wall, in combination with a housing composed of separate similar halves, each half comprising a semicylinder to receive the stamp-head and a base with a flat inclined outer face to fit the inclined side wall of the top opening of the mortar-body, whereby the two halves are wedged together in seating, and packing between the said wall and base, whereby the housing is tightened in its seat.

3. In a stamp-mill mortar, a mortar-body having in its top an extended continuous opening provided with inclined. downwardlyconverging side walls, in combination with a housing composed of separate similar halves, each half comprising a series of connected semicylinders, to receive the stamp-heads, and a continuous'base common to all the semicylinders, and formed with a flat inclined outer face, adapted to be seated in the side wall of the top opening of the mortar-body, whereby the halves are wedged together in seating.

4. In a stamp-mill mortar, a mortar-body having in its top an extended continuous opening provided with inclined downwardlyconverging side walls, in combination with a housing composed of separate similar halves, each half comprising a series of connected semicylinders, to receive the stamp-heads, and a continuous base common to all the semicylinders, and formed with a flat inclined outer face, adapted to be seated in the side wall of the top opening of the mortarbody, whereby the halves are wedged together in seating, and packing between said walls and faces, whereby the housing is tightened in its seat.

5. In a stamp-mill mortar, a mortar-body having an opening in its top, in combination with a housing adapted to fit said opening, said housing consisting of a cylindrical sleeve adapted to receive the stamp-head, the interior of the sleeve having its lower portion wider than its upper portion, whereby a horizontal shoulder is formed between the two portions. v

6. In a starnp-mill mortar, a mortar-body having an opening in its top provided with an inwardly-inclined wall, in combination with a housing composed of separate similar halves, each half comprising a semicylinder to receive the stamp-head and abase with a flat inclined outer face to fit the inclined side wall of the top opening of the mortar-body, whereby the two halves are wedged together in seating, the interior of said semicylinder having its lower portion wider than its upper portion, whereby a horizontal shoulder is formed between the two portions. 7. In a stamp-mill mortar, a mortar-body having an opening in its top provided with an inwardly-inclined wall, in combination with a housing composed of separate similar halves, each half comprising a semicylinder to receive the stamp-head and a base with a fiat inclined. outer face to fit the inclined side wall of the top opening of the mortar-b0dy, whereby the two halves are wedged together in seating, the interior of said semicylinder having its lower portion wider than its upper portion whereby a horizontal shoulder is formed between the two portions, and pack ing between said walls and faces whereby the housing is tightened in its seat.

8. In a stamp-mill mortar, a mortar-body provided with an extended continuous opening in its top, formed with inclined downwardly-converging side walls, in combination with a housing formed in separate similar halves, each half comprising a connected series of semicylinders to receive the stampheads, and a continuous base, common to all said semicylinders, and formed with a flat outer inclined face adapted to be seated in the inclined side wall of the top opening of the mortar-body, the interior of each semicylinder being provided with a horizontal shoulder formed by a lower portion of relatively larger width.

9. In a stamp-mill mortar, a mortar-body having in its top an extended continuous opening provided with inclined downwardlyconverging side walls, in combination with a housing composed of separate similar halves, each half comprising a series of connected semicylinders, to receive the stamp-heads, and a continuous. base common to all the semicylinders, and formed with a flat inclined outer face, adapted to be seated in the side wall of the top opening of the mortarbody, whereby the halves are wed ed together in seating, and suitable packing between said walls and faces.

10. In a stamp-mill mortar, a stamp-head housing fitted in the top of the mortar, and consisting of a sleeve the interior of which is divided into an upper portion and a lower wider portion separated by a shoulder, said interior having inwardly-projecting narrow ribs, in a plane at right angles to its axis.

1 In1 witness whereof I have hereunto set my ianc.

MARTIN P. BOSS.

Witnessesr J. COMPTON, D. B. RICHARDS. 

